I'm no pro, but I can't see any other way. If the sand is in there, trying something like using compressed air may only push it in further. I'd suggest looking for a detailed guide (preferably with pictures), some prayer beads, good luck, and a some fine tools. Of course, you'd void your warranty, but they wouldn't replace it anyway (I think so, at least).
From seeing pics of the Storm, it doesn't seem like disassembling it would cause any permanent damage, as long as you know what you're doing and don't damage any parts.
Not sure if this will get all of it out but go to Youtube and search for the tutorial of removing the Storm's screen and cleaning out the dust underneath .... I did it and it worked pretty well and was not difficult
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